How does the density of natural and manufactured gas compare to air?

The correct choice is that natural and manufactured gas is lighter than air. This is an important distinction in plumbing design and gas handling.

Natural gas primarily consists of methane, which has a lower molecular weight compared to the average molecular weight of air. As a result, when natural gas or manufactured gas is released, it tends to rise and disperse into the atmosphere rather than settling close to the ground. This property is crucial for safety reasons, as it helps to reduce the risk of accumulation in enclosed spaces where it could pose a fire or explosion hazard.

The understanding of gas behavior in relation to air density assists plumbing designers and engineers in determining proper venting and gas piping layouts, ensuring that any gas leaks can dissipate safely and do not endanger personnel or property. Knowledge about gas buoyancy is also instrumental in selecting the appropriate materials and systems for gas delivery and ensuring compliance with safety codes and regulations.

In contrast, other choices imply characteristics that do not align with the physical properties of natural and manufactured gas, which is why they do not accurately reflect the behavior of these gases in relation to air.